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- a region of a chromosome where it attaches to a spindle fiber during mitosis and meiosis
- the structure located at a specific site on the chromosome that holds the two chromatids together; it is the site of attachment for the spindle fibers during cell division; also called primary constriction or kinetochore
- The central portion of the chromosome to which the spindle fibers attach during mitotic and meiotic division.
- Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row